How often must outlet screens and aerators of water dispensers be cleaned to rem

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试卷: WELL AP模拟题英文C卷[查看]
How often must outlet screens and aerators of water dispensers be cleaned to remove debris and sediment? 每隔多久要清洗一次饮水机的出水口滤网和起泡器，以清除残余物和沉淀物？
A: Quarterly 每季度
B: Every week 每星期
C: Every 2 months 每2个月
D: Every month 每月

参考答案: A

本题解释:
正确答案：A